Gaff hook



FIG. 1 is a front elevational view of the gaff hook showing my new design;

FIG. 2 is a back elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view;

FIG. 5 is a right elevational view; and,

FIG. 6 is a left elevational view. 

The ornamental design for a gaff hook, as shown and described. 